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Python 3.5 中的新typing模块提供了许多用于类型注释的工具。它是否提供了封装概念的对象或类型?功能的概念如何?

在下面定义装饰器的代码中,应该代表什么class_?应该代表什么function?(typing.Callable是不够的,因为例如一个类是可调用的,但代码试图识别方法。) (模块本身的no_type_check()装饰器typing可能是这样行为的装饰器的原型。no_type_check()它本身没有任何注释,类型提示或其他。)

import typing

def is_double_underscore_name (name):
    return len(name) > 4 and name.startswith('__') and name.endswith('__')

# This code will not run, because 'class_' and 'function' are names that do not have any
# predefined meaning. See the text of the question.

# Note: This modifies classes in-place but (probably) does not modify functions in-place;
# this is not a considered design decision; it is just the easiest thing to do in a very
# basic example like this.
def do_something (class_or_function: typing.Union[class_, function]):
    if isinstance(class_or_function, class_):
        for name in class_or_function.__dict__:
            if not is_double_underscore_name(name):
                object = class_or_function.__dict__[name]
                if isinstance(object, function):
                    class_or_function.__dict__[name] = do_something(object)
        return class_or_function
    else:
        ... # return the function, modified in some way
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1 回答 1

3

类是类型的实例type

函数的类型为types.FunctionTypetypes.BuiltinFunctionType

方法的类型为types.MethodTypetypes.BuiltinMethodType

types很长一段时间以来,它一直是 Python 的一部分。

于 2015-12-25T00:40:53.273 回答